Card room bobbin



Dec. 21, 1954 c. e. STOVER CARD ROOM BOBBIN Filed July 21, 1952 IN VENTOR Charles fiiStover MM W ATTORNEYS United States Patent CARD ROOM BOBBIN Charles G. Stover, West Point, Ga.

Application July 21, 1952, Serial No. 299,931

1 Claim. (Cl. 242-120) The present invention relates to bobbins which are used in the textile industry and relates particularly to wooden bobbins such as card room or roving bobbins.

Bobbins of the type under consideration are conventionally constructed of wood. These bobbins receive rough handling in ordinary use and there is thus a tendency for the wood to split. Changes in moisture content of the wood also contribute to the tendency toward splitting of the bobbins. These bobbins are driven by engagement of slots therein with a driving lug of a bobbin gear. This engagement results in wear of the bobbins and necessitates their eventual replacement. These bobbins are quite expensive and the cost of replacement represents a substantial item of expense in the textile industry.

It is a primary object of the present invention to provide wooden bobbins such as card room or roving bobbins which have a reduced tendency to split.

A further object of the invention is to provide a bobbin of the type under consideration which does not encounter excessive wear through engagement of the bobbin with the bobbin gear.

Still another object of the invention is to provide a reinforcement for bobbins which reinforcement is intimately and securely bonded to the wooden bobbin in such a manner that the reinforcement will not be displaced during even the roughest usage of the bobbin.

The foregoing and other objects and advantages of the invention can be understood from the following detailed description which has reference to the accompanying drawing wherein:

Figure 1 is a longitudinal, sectional view of a bobbin constructed in accordance with my invention, the view being taken generally in the direction of the arrows along the line 11 of Figure 2;

Figure 2 is a bottom plan view of the bobbin shown in Figure 1, and

Figure 3 is a transverse, sectional view taken in the direction of the arrows along the line 3-3 in Figure l.

The bobbin is provided with a barrel 4 having a surface 5 on which the roving is wound. The barrel 4 of the bobbin is provided with a base 6 of larger external diameter than the barrel. The base 6 is provided with an internal, downwardly facing, annular shoulder 7 as best shown in Figure 1 The base 6 is provided with a plurality of generally radially extending bobbin driving slots 8. Eight such slots are illustrated in the drawing although a greater or lesser number may be used. The slots 8 are intended to engage a lug on a conventional bobbin gear for imparting rotary motion to the bobbin. The height of the bobbin driving slots 8 is such that those slots terminate considerably below the internal annular shoulder 7.

An annular groove 9 is formed in the lower end of the base 6 of the bobbin. The groove 9 has an upper wall 10 which is positioned above the level of the internal annular shoulder 7. A ring 12 may be positioned in the groove 9 against the upper wall 10 and may be in engagement with the inner wall 13 of the groove. The ring 12 is preferably an endless wire ring although in some instances it need not be a continuous ring and it may be of material other than metal. The ring 12 serves the function of preventing splitting of the base 6 of the bobbin. The positioning of the ring 12 above the level of the annular shoulder 7 increases the reinforcing effect of the ring on the bobbin.

The wire ring 12 can perform its function of reinforcing ice the base 6 against splitting only so long as that ring is retained in its appropriate position in the groove 9. l have found it to be essential to provide means for permanently securing the ring against displacement. This means consists of a body of thermally set resinous material which completely fills the groove 9 below the ring 12 and which is intimately bonded to the walls of the groove. The outer wall 14 of the groove 9 is provided with a plurality of vertical ridges 15 which preferably extend substantially the full vertical length of the groove. The outer wall 14 of the groove is also provided with a peripherally extending recess 16 which is preferably located near the upper end of the groove 9 but below the level of the ring 12.

The wire ring 12 and the resinous bonding material are preferably placed in the groove 9 and permanently secured thereto prior to the cutting of the bobbin driving slots 8 in the base 6. The body of resinous material is designated generally by the reference numeral 17 and it may consist of any thermo-setting resin having the requisite strength and hardness. I have found that resins of the urea-formaldehyde type are satisfactory, although obviously the invention is not limited to the use of such resins. The resinous material is placed in the groove 9 in an uncured state. In this state the resinous material will be in paste form. The groove is completely filled with the pasty material. This material is tamped in the groove to make certain that the furrows between the vertical ridges 15 and the peripherally extending recess 16 are completely filled. The resinous material is then cured at the temperature which is recommended for the particular resin involved. This temperature will be sufficiently low to prevent damage to the wood of the bobbin. There results an integral body of the resinous material. This body has an integral, peripherally extending portion 18 which lies within the periphery extending recess 16. The body 17 of resinous material also has integral, vertically extending ridges 19 which lie in the furrows between the ridges 15.

The peripherally extending ridge 18 and the recess 16 cooperate to prevent the body of resinous material 17 from being dislodged from the groove 9. The vertically extending ridges 15 on the outer wall 14 cooperate with the ridges 19 on the plastic member 17 to prevent circurnferential creeping of the plastic member within the groove 9. The plastic material should have relatively high shearing strength so that the members 18 and 19 will not be sheared from the remainder of the body.

It will be apparent that when the bobbin driving slots 8 are cut in the base of the bobbin, portions of the plastic material will be exposed in the upper wall and the side walls of the slots. This exposed resinous material will engage the lug of the bobbin gear and the material has suflicient hardness and resistance to wear to greatly prolong the life of the bobbin.

My invention provides a reinforced bobbin which has the advantages above enumerated and which is, in effect, an integral unit. The intimate bonding of the resinous material 17 to the base 6 effectively retains the reinforcing ring 12 in position. The bobbin is thus effectively prevented from splitting. The portions of the resinous material 17 which are exposed in the walls of the slots 8 serve to reduce wear of the slots. These factors cooperate to greatly prolong the useful life of the bobbins.

I have illustrated and described what I consider to be the preferred embodiment of my invention. However, the embodiment which has been illustrated and described is exemplary only and the broader scope of the invention is defined by the following claim.

Having thus defined my invention, I claim:

A card room bobbin having an annular wooden base, an internal downwardly facing annular shoulder above the lower end of said base, an annular downwardly facing groove in the lower end of said base, the upper wall of said groove being above the level of said annular shoulder, a wire ring in said groove above the level of said annular shoulder and positioned against said upper wall of said groove, said wire ring tightly engaging the inner wall of said groove to reenforce said wooden base against splitting, a side wall of said groove having References Cited in the file of this patent Number 5 367,622 426,346 729,095 912,564 1,893,320

tom of said base and said resinous body and terminating 10 2,038,892

below the upper end of said resinous body.

Number UNITED STATES PATENTS Name Date Hardy Aug 2, 1887 Wells Apr 22, 1890 Rabbeth May 6, 1903 Hastings Feb 16, 1909 Baldwin Jan. 3, 1933 Cundey Apr. 28, 1936 Meyer Jan. 14, 1941 FOREIGN PATENTS Country Date Great Britain Dec. 9, 1948 

